Carburetor



vG. R. WELCH CARBURETOR Original Filed July-Q1, 1919.

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Patented' Nov. 1-92 5.

uNrrEu STATES 1,562,670 PATENT OFFICE.

' GEOGE R. WELCH, 0F DETROIT, MICHIGAN.

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originan applicationmed :my a1, 1919, serial No. s1aso4. Divided aria this pputin'aled ny s,

4 v 11125,. serial No. 28,171.

use with an internal combustion engine by fmeans of which a lo'W grade fuel ycan be satisfactorily used. This application isa division of my application Serial No. 312,304,

filed July 21, 1919.

provide a structure in which the exhaust gases are employed .for vaporizing the incoming fuel charges by transmitting heat to thesurface over which saidchargespass. More specifically, thev invention compre 'hendsa device of this character embodying a closedchamber intofwhich'the exhaust gases are introduced whereby the pulsating pressure causes a flow o-f the gases into and vout of vthis chamber.`

In the drawingsforming a part of this application,"V

, Figure'lis a side elevation of a portion of `an engine with my preferredform' of 39 vcarburetor in place thereon, w-ith the'ffl-oat i chamber thereof in vertical section and other parts broken away. I

Fig. 2 is a section of the carburetor de- A tachedponthe lne.2-2 of Fig. 1. Fig. 3 is-anenlarged section on the line `3-4-3 of Fig. 2. v i

Referrin to Fig. 1 of the drawings, 5 is a portion o a four cylinder engine. 6. is the intake manifold and 7 is the exhaustl manifoldof the engine. In the preferred form,

my improved carburetor consists of' a depending bod casing 8 which is preferably cast integra with the exhaust manifold. The walls decrease in widthtoward the 45, lower end and are provided with piercedinternally threaded lugs 9. At the top, casing 8 is as wide as the distance transversely and horizontally through the manifold and the v,

front edges are faced for the receptionA of'a thin sheet metal plate 10 which forms the inner .wall of the narrow air passage 11. An outer plate 12 having anges which control with the edges of plate 10, land having lugs 13 which register with lugs 9, is secured to casing 8 by screws 14 which. pass tli rough It is a primary object of this invention to ber. Port 26 is controlledby .valve27 which is covered bya U-shaped plate 32 which is lugs 13 and screw into lugs 9. i A port ,15

in the upper portion `of platel 12 admits"airV to `the passagef-gA-floatchamber casing 16 has an attachingine'mber ""1'63': fvvhich is Arecessed slightly at'the toptoform a continuo0 ation, of passage 11 'and v has afvertical channel 18 which opens into vpassage 11. This 'attaching member"v is secured to Acasing 8 by` boltsSl which pass through flanges 8h on the bottom edge o casing 8 and flanges 16"' on member 16n as lshown in'Fig. 4. Al channel 19 connectswith` channel 18. A port:I 20, opens from channel 19 into the floatfcham" ber and is controlled by needle valve 22'1" which regulates the amount offuel that "is ifo allowed to pass through port 20. The lloat chamber vhas acover 23 provided with the boss 24 having a channel 25 therein. A port 26 connects channel 251with the float cham- '15 is operated by lever 28 Apivoted to casing.

vA'iloat 29 is secured to'lever Al liquid supply pipe 30 is connected to boss 24. `Opposite plate 10 is a like thin plate 31 which secured to body and forms a narrow full passage 33 whichpassage opens into a chanl nel 34 in boss 35` on plate 32. A tube 36 is vconnectedgto boss 35 and opens into the air inlet casing 37 Vwhich hasv mounted vtherein the airregulating valve 39, the bottom of which is heavier than the top. Casing 37 is provided-,with butterly valve 40 having' operating lever 4.1 which is operated by the usual 'pull rod, not shown, from the drivers 90 seat. ASaid 'casing has attaching lugs 42 for attachment to the intake' manifold 6.I The- Sp'ace betweenplates 10"' 'and 31 opens at the top into theeX-haust manifold. I

The plateslO and 31 are made of brass from .010 to .025 in thickness and are preferably dade of brassof a thicknessof .015. By reason of its increased conductivity plates formed of aluminum alloy (e.

duralumin) may be substituted for the grass and these aluminum alloy plates may hago a thicknesl of .015 tpgOll. h

ing P135, ows down' 11 and isg heatedpelily contact with the thin wall 10 which is in contact with the interior of the exhaust air picks up fuer :aerea-em. rhs 119 turn is heated by Contact with .ducing any back pressure.

heated air, together with the fuel, passes up the passage 33 where the fuel is vaporized by contact with the thin plate which in its the exhaust gases from f`the exhaust pipe 7. The wedge shaped passage provided for the vaporized fuel prevents the expansion in volume pro- Further, the increase in area of the passage 33 slows down the velocity. Hence the gases will not carry in suspension any unvaporized fuel which is thereupon deposited onthe walls of the passage where it flows down by gravity and is vaporized by the heated' fresh air entering the bottomof the passage 33. A heated rich mixture-therefore issues from the outlet from the passage 33. This rich mixture is diluted with cold air by an automatic diluting valve in the well-known manner and is thereafter taken into the engine where it is burnt.

Uleanng.-In order to clean the vaporizer theplate 3l, where carbon accumulates, and the cap screws14 are removed and the plate 3l is freed from the exhaust pocket 8. The plate 3l isthen easily removed when it can be cleaned very easily. The carbon is removed from both sides because a certain' amount of carbon accumulates on the inside in contact with the exhaust gases. The

cost of renewing a plate is only a matter of a few cents. The whole operation ofreplacing the old plate 31 fora clean new one only takes about five minutes.

I claim as my invention:

1. The combination with an internal com;

bustion engine having an exhaust pipe, of a closed chamber communicating with said exhaust pipe by a single opening, so that the pulsating pressure in said exhaust pipe causes a flow of hot gases into and out of said chamber, said chamber extending to a substantial distance from said exhaust' pipe, means forming a mixing chamber, said chamber having an ai'r inlet, a fuel nozzle dischar ing into said mixing chamber, vand means nming a. passage leading from said mixing chamber to the intake of said internal combustion en ine, a wall of said passage being forme e by a wall. of said closed heating, chamber, the parts -bein arranged that the air and fu mixture comes into contact with the wall of the heating chamber remote from the exhaust pipe.

2. In combination with an internal comf bustion engine having an exhaust pi e, a heating device comprising a closed c amber communicating with said exhaust pipe by a single port only, so that the pulsating pressure in the exhaust pipe causes a flow of hot gases into and out of said chamber.

3. The combination with an internal combustion engine having an exhaust conduit, a heating device comprising a closed chamber having a Wall of thin metal, means for establishing communication between said exhaust conduit and'said chamber, whereby the pulsating pressureof the exhaust conduit causes a flow of hot gases into and out of said chamber, and a fuel passageway disposed adjacent the 'thin wall of said closed chamber through which fuel passes for delivery to the internal combustion engine.

4. The combination with an internal combustion engine having an exhaust pipe, a

heating device comprising a closed chamber having tapering side walls communicating with the exhaust pipe at a single port only, so that the pulsating pressure in the exhaust pipe causes-a iow of hot gases into and out of said chamber, a' casing surrounding said chamber, and means for admitting fuel to -said chamber at the small end 'of a tapered wall thereof to pass over said wall toward the large end.

5. The combination with an internal combustion engine having an exhaust pipe, of

a closed chamber communicating with said exhaust pipe having av tapering wall of thin metal, means for establishin communication between the exhaust pipe and said chamber whereby the pulsating pressure of the exhaust conduit causes a iow of hot gases into and out of said chamber, a fuel passageway disposed adjacent the lthin wall of said closed chamber, means for introducing fuel to the passageway at the nar. row portion of said thin wall to pass over the tapering wall toward the'wider portion thereof for delivery to the internal com;

busti-on engine. A

In testimony whereof I aiix my si ature. GEORGE R. gn

WELCH. 

